The pain, oh the pain when a customer tells you there is something not right with his turntable and you figure out what the problem is:
Yep, cantilever bent backwards.
Phono cartridges are a very delicate piece of mechanical/electrical engineering. These little devices convert the grooves embedded in our precious LPs into a minuscule electrical voltage which then gets amplified several thousand times until it gets transduced into airwaves and beautiful music for our ears.
This one got replaced by a Nagaoka MP200 moving magnet cartridge and the customer is very happy with the replacement since, as many have reported, the above cartridge (Grado Sonata) is prone to hum issues with some brands of phono preamplifiers.
Enjoy!
Vic